Regarding appliances running off the higher "Bulk" charge voltage.. not really a problem.. You can do this two ways.. But First let me tell you about the layout in my, rather poorly in my not very humble opinion (And well educated I might add opinion) RV.
The batteries are under the steps, Front, entry side, the power leads then run up to the very front where the BCC (Battery control center) and isolator/boost relays are then ALL THE WAY to the rear of the 37'7" RV, I mean the very back wall, stopping amidships to connect to the fuse block, and there.. Thats where they put the PDI 9180 with wizard.
A much better way would have been to put the IntellaPower converter next to the batteries, then run lines to the batteries and then on back,
Or if you want it on the house side of the disconnect switch, Put it next to the BCC and hook it in there.
In both of these arraingments the load of the battery will tend to protect the house from over voltage.
In my case... not so lucky
So, how much problem have I had in 9 years of running most of the time with the 9280 operating?
NOT A ONE. I have lost some electronics,, but in no case do I suspect over voltage on the 12 volt side of doing the damage.. (Poor quality and bad design yes, excessive voltage no) which by the way is why I push Dinosaur Borads for your 12 volt appliances... Much better quality, and in some (At least) Cases design as well.
